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dafd46bbb2
Something has broken MTU functionality in Xen: specifically, setting MTUs larger than 1500 fails. This prevents Jumbo Frames and other features which require larger than 1500 byte MTUs from being used. This can lead to a failure to sync/connect to other components in the cluster/cloud which expect higher MTUs and result in unavailable services. The issue is caused by the following commit to the xen-netfront driver: "xen-netfront: Fix race between device setup and open" commit f599c64fdf7d9c108e8717fb04bc41c680120da4 The following commits fix this issue in the mainline kernel: "xen-netfront: Fix mismatched rtnl_unlock" commit cb257783c2927b73614b20f915a91ff78aa6f3e8 "xen-netfront: Update features after registering netdev" commit 45c8184c1bed1ca8a7f02918552063a00b909bf5
27 lines
791 B
Diff
27 lines
791 B
Diff
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
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index d7dc95f58dae..31bc4210f969 100644
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--- a/drivers/net/xen-netfront.c
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+++ b/drivers/net/xen-netfront.c
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@@ -1958,10 +1958,6 @@ static int xennet_connect(struct net_device *dev)
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/* talk_to_netback() sets the correct number of queues */
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num_queues = dev->real_num_tx_queues;
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- rtnl_lock();
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- netdev_update_features(dev);
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- rtnl_unlock();
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-
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if (dev->reg_state == NETREG_UNINITIALIZED) {
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err = register_netdev(dev);
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if (err) {
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@@ -1971,6 +1967,10 @@ static int xennet_connect(struct net_device *dev)
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}
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}
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+ rtnl_lock();
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+ netdev_update_features(dev);
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+ rtnl_unlock();
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+
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/*
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* All public and private state should now be sane. Get
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* ready to start sending and receiving packets and give the driver
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